<?php
/**
 * Zend Framework
 * LICENSE
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 * @category Zend
 * @package Zend_Filter
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 * @version $Id: Compress.php 24593 2012-01-05 20:35:02Z matthew $
 */
/**
 *
 * @see Zend_Filter_Interface
 */
require_once 'Zend/Filter/Interface.php';

/**
 * Compresses a given string
 * @category Zend
 * @package Zend_Filter
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 */
class Zend_Filter_Compress implements Zend_Filter_Interface {

    /**
     * Compression adapter
     */
    protected $_adapter = 'Gz';

    /**
     * Compression adapter constructor options
     */
    protected $_adapterOptions = array();

    /**
     * Class constructor
     * @param string|array $options (Optional) Options to set
     */
    public function __construct ($options = null) {
        if ($options instanceof Zend_Config) {
            $options = $options -> toArray ();
        }
        if (is_string ($options)) {
            $this -> setAdapter ($options);
        } elseif ($options instanceof Zend_Filter_Compress_CompressInterface) {
            $this -> setAdapter ($options);
        } elseif (is_array ($options)) {
            $this -> setOptions ($options);
        }
    }

    /**
     * Set filter setate
     * @param array $options
     * @return Zend_Filter_Compress
     */
    public function setOptions (array $options) {
        foreach ($options as $key => $value) {
            if ($key == 'options') {
                $key = 'adapterOptions';
            }
            $method = 'set' . ucfirst ($key);
            if (method_exists ($this, $method)) {
                $this -> $method ($value);
            }
        }
        return $this;
    }

    /**
     * Returns the current adapter, instantiating it if necessary
     * @return string
     */
    public function getAdapter () {
        if ($this -> _adapter instanceof Zend_Filter_Compress_CompressInterface) {
            return $this -> _adapter;
        }
        $adapter = $this -> _adapter;
        $options = $this -> getAdapterOptions ();
        if ( ! class_exists ($adapter)) {
            require_once 'Zend/Loader.php';
            if (Zend_Loader::isReadable ('Zend/Filter/Compress/' . ucfirst ($adapter) . '.php')) {
                $adapter = 'Zend_Filter_Compress_' . ucfirst ($adapter);
            }
            Zend_Loader::loadClass ($adapter);
        }
        $this -> _adapter = new $adapter ($options);
        if ( ! $this -> _adapter instanceof Zend_Filter_Compress_CompressInterface) {
            require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception ("Compression adapter '" . $adapter . "' does not implement Zend_Filter_Compress_CompressInterface");
        }
        return $this -> _adapter;
    }

    /**
     * Retrieve adapter name
     * @return string
     */
    public function getAdapterName () {
        return $this -> getAdapter () -> toString ();
    }

    /**
     * Sets compression adapter
     * @param string|Zend_Filter_Compress_CompressInterface $adapter Adapter to use
     * @return Zend_Filter_Compress
     */
    public function setAdapter ($adapter) {
        if ($adapter instanceof Zend_Filter_Compress_CompressInterface) {
            $this -> _adapter = $adapter;
            return $this;
        }
        if ( ! is_string ($adapter)) {
            require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception ('Invalid adapter provided; must be string or instance of Zend_Filter_Compress_CompressInterface');
        }
        $this -> _adapter = $adapter;
        return $this;
    }

    /**
     * Retrieve adapter options
     * @return array
     */
    public function getAdapterOptions () {
        return $this -> _adapterOptions;
    }

    /**
     * Set adapter options
     * @param array $options
     * @return void
     */
    public function setAdapterOptions (array $options) {
        $this -> _adapterOptions = $options;
        return $this;
    }

    /**
     * Calls adapter methods
     * @param string $method Method to call
     * @param string|array $options Options for this method
     */
    public function __call ($method, $options) {
        $adapter = $this -> getAdapter ();
        if ( ! method_exists ($adapter, $method)) {
            require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception ("Unknown method '{$method}'");
        }
        return call_user_func_array (array($adapter, $method), $options);
    }

    /**
     * Defined by Zend_Filter_Interface
     * Compresses the content $value with the defined settings
     * @param string $value Content to compress
     * @return string The compressed content
     */
    public function filter ($value) {
        return $this -> getAdapter () -> compress ($value);
    }

}
